Testing on Irvine-based electric vehicle maker Rivian’s delivery vans for Amazon continues to expand with the latest push into Oklahoma.

Amazon is testing the vans for deliveries in the greater Tulsa area. This is the third market the vans have now been deployed to after Los Angeles and San Francisco.

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Amazon said it will be using the Rivian vans in 16 locations this year, with 10,000 vans running by as early as 2022.

Amazon is one of several Rivian investors that also includes Ford Motor Co., Cox Automotive, Fidelity Management and Research Company, Soros Fund Management LLC and BlackRock funds. The automaker has raised more than $5 billion to date.